Minimig Video d/a resistor ladder
Jump to navigation
Jump to search
- Equations:
- Total resistance = 1/(1/4000+1/2000+1/1000+1/560)+75
- Common current through resistor ladder plus vga impedance (75 ohm) = 3.3V / 357.8282..
- Current * vga impedance = 0.6917V (specification says 0.7 p-p)
- Output voltage = 75 * (3.3/(1/(1/4000+1/2000+1/1000+1/560)+75)) = 0.6917V
- Simplification:
- U = (75*3.3)/(1/(1/4000+1/2000+1/1000+1/560)+75) = 0.6917V
- wikipedia: Resistor
- wikipedia: Preferred number
- digikey: Resistors